The general consensus is that cresties don't need UV light. The reasoning is since they are nocturnal and hide during the day they get little to no UV rays in the wild. you do need to give a light cycle but a normal house light bulb will do. the D3 in their food is all they need, as long as you are using a complete diet such as Repashy super food. as far as i know you would have to feed an exceedingly large amount of D3 to hurt the gecko, they typically just pass any extra nutrients.
There actually isn't D3 in UV rays, but the body of many animals produces D3 when exposed to UV rays. This aids in the absorption of calcium. So this is why it is very important reptiles get as much as they need.
2.1.0 Rhacodactylus Ciliatus Jasper, Taz, Hunter
0.0.1 Rhacodactylus Chahoua [PI](unnamed)
1.1.0 Holland lop Marley, Ella